I think you can do it for free. But you need to change your account name on twitter. I am do this for one my account and now i have new audit. There is a problem if you joined on any campaign with old username.
Already tried but it didn't worked. Also kinda risky since someone else can take over your username this way. Also I wish they'd accept Paypal not only credit cards not even mentioning the credit card processor!
That is the biggest problem for me, I would have paid 4.99$ but they dont accept anything other than Cards. Anyone of the Twitteraudit member in this forum?? Please add another payment gateway or accept Bitcoins, you will get allot of members in a day.